[clang] [Clang][Sema] Fix malformed AST for anonymous class access in template. (PR #90842)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

Thank you for this fix.

You should reference the issue that this fixes in your summary.

This also need a release note.

https://github.com/llvm/llvm-project/pull/90842